Symfony 4 was released on November 30th.
Update now to the best Symfony ever!

Propel

Propel is an open-source Object-Relational Mapping (ORM) for SQL- Databases in PHP 5.4. It allows you to access your database using a set of objects, providing a simple API for storing and retrieving data. But not only plain ORM but it also provides database schema migration, reverse engineering of existing database and much more.

Components used by this project